Really depends on your school. Hell just after I graduated high school they changed it all up. But from me it was: Math 1 (Pre-Algebra) standardly taken in 9th grade. Math 2 (Algebra and Geometry) 10th grade. Math 3 (Adv Algebra and Trig) 11th grade. Math 4(Adv Trig and Pre-calc) 12th grade. Math 5 was Calc, but I didn't make it that far - only 4 years of HS :P. But if you took the "advanced" math tract you started with Math 2 and ended with Math 5.
I took advanced math 6, 7, 8th grade (basically you took the same math class as 1 grade above you), with 8th grade being Pre-Algebra but IDK if it was my teacher or what but I didn't get it very well and after about the 1st quarter of Math 1 I was very grateful I took Pre-Algebra again in 9th grade. Much better understanding of it :D.
algebra 1...algebra 2....Geometry...pre Calculus and Calculus
In 5th grade i was in advanced math so i took a little algebra
what about statistics?